deb http:
//mirrors.aliyun.com/ubuntu trusty main restricted

deb-src http:
//mirrors.aliyun.com/ubuntu trusty main restricted

 
## Major bug fix updates produced after the
final
release of the

## distribution.

deb http:
//mirrors.aliyun.com/ubuntu trusty-updates main restricted

deb-src http:
//mirrors.aliyun.com/ubuntu trusty-updates main restricted

 
## N.B. software from
this
repository is ENTIRELY UNSUPPORTED by the Ubuntu

## team. Also, please note that software in universe WILL NOT receive any

## review or updates from the Ubuntu security team.

deb http:
//mirrors.aliyun.com/ubuntu trusty universe

deb-src http:
//mirrors.aliyun.com/ubuntu trusty universe

deb http:
//mirrors.aliyun.com/ubuntu trusty-updates universe

deb-src http:
//mirrors.aliyun.com/ubuntu trusty-updates universe

 
## N.B. software from
this
repository is ENTIRELY UNSUPPORTED by the Ubuntu

## team, and may not be under a free licence. Please satisfy yourself as to

## your rights to use the software. Also, please note that software in

## multiverse WILL NOT receive any review or updates from the Ubuntu

## security team.

deb http:
//mirrors.aliyun.com/ubuntu trusty multiverse

deb-src http:
//mirrors.aliyun.com/ubuntu trusty multiverse

deb http:
//mirrors.aliyun.com/ubuntu trusty-updates multiverse

deb-src http:
//mirrors.aliyun.com/ubuntu trusty-updates multiverse

 
## N.B. software from
this
repository may not have been tested as

## extensively as that contained in the main release, although it includes

## newer versions of some applications which may provide useful features.

## Also, please note that software in backports WILL NOT receive any review

## or updates from the Ubuntu security team.

deb http:
//mirrors.aliyun.com/ubuntu trusty-backports main restricted universe multiverse

deb-src http:
//mirrors.aliyun.com/ubuntu trusty-backports main restricted universe multiverse

 
deb http:
//security.ubuntu.com/ubuntu trusty-security main restricted

deb-src http:
//security.ubuntu.com/ubuntu trusty-security main restricted

deb http:
//security.ubuntu.com/ubuntu trusty-security universe

deb-src http:
//security.ubuntu.com/ubuntu trusty-security universe

deb http:
//security.ubuntu.com/ubuntu trusty-security multiverse

deb-src http:
//security.ubuntu.com/ubuntu trusty-security multiverse

使用方法：

1.备份源配置文件 sudo cp /etc/apt/sources.list /etc/apt/sources.list_backup

2.用编辑器打开源配置文件 sudo gedit /etc/apt/sources.list

3.删除文件内容，更换为以上内容